Stockholders' Equity Note Disclosure [Text Block] (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) shares
Treasury Stock, Shares, Acquired | shares	2,211,629
Treasury Stock, Value, Acquired, Cost Method | $	$ 44,442
Treasury Stock
Treasury Stock, Value, Acquired, Cost Method | $	$ 44,442
Stock Issued During Period, Shares, Share-based Compensation, Gross | shares	12,671
Private Placement Member
Treasury Stock, Shares, Acquired | shares	703,000
Treasury Stock, Value, Acquired, Cost Method | $	$ 13,975
Tender Offer
Treasury Stock, Shares, Acquired | shares	1,385,118
Treasury Stock, Value, Acquired, Cost Method | $	$ 27,702